So a while back, I decided that I would install USB loader GX to try out a few games before buying, or play ones I wouldn't use enough to buy. Everything with this worked perfectly. Then a while later I realized that my console is having issues playing custom songs on music games (eg. Rock Band 2,3), and in addition, my huge library of custom songs in RawkSD crashes the game. In hindsight, I know the cause was installing USB Loader GX, particular the part where you modify some IOS's (37 and 38 in particular)
. I dont particularly care about USB Loader GX anymore, and RawkSD is a preference, but my main goal is fixing the legit paid for DLC

So my questions are:
1) Is there by any chance and uninstaller and/or uninstall guide?
2) If not, is it possible to revert the IOS changes without losing data on my Wii?
3) If not, is there an update to any IOS's that could fix or bypass this issue?